SMD to DPI pcb conversion - Electronic Circuits Projects Diagrams Free

student1616 · 11th December 2006, 04:25 PM

hello all
while going through my regular feeds yesterday i found a PCB etching process (in instructables.com)for SMD components using salt water as processing solution.
http://www.instructables.com/id/EKVI...566X/?ALLSTEPS

the method is nice but for 6pin SMD's(like max2606) i found it hard.so is there any pre-existing pcb layouts for the SMD IC's,so that we can go with the conventional procedure of laser printing and etching.
a little help will be appreciated.
regards

justDIY · 11th December 2006, 04:53 PM

using Eagle, go to file, new, board ... don't bother with a schematic.

add the pad layouts for your SO package and your DIP package, and use the WIRE tool to connect them... then print, iron and etch

student1616 · 11th December 2006, 06:30 PM

thanks for the reply.
but hhhmmmmm my drawing skills always sucks.i tried but unable to get correct layout.if some one tried this before pls share ur experience

justDIY · 11th December 2006, 06:36 PM

you don't have to draw anything ... you're simply taking two pre-drawn layouts and connecting lines from Pin 1 to Pin 1, Pin 6 to Pin 6, etc

if you had an odd package layout, someone might draw it for you, but a 6 pin (sot23-6 I assume) package is as standard as sliced bread.

student1616 · 12th December 2006, 09:02 AM

thanks "just diy"
with ur inspiration i tried and finished with a good one(i think so)
i placed sod23-6,DPI pads and connected them through wires.pls have a look at the picture. http://img81.imageshack.us/img81/5020/1zf3.png
but one thing bothering me is correct resolution(while exporting as image).when i used 150 it gave me above picture but if i increased it,the image size increased with the quality of pic.so what is the correct resolution for taking printout and etching it.

justDIY · 12th December 2006, 01:20 PM

I export mine at 1200 DPI and then instruct the printer to print at that resolution, so it comes out 1 to 1

export at whatever resolution you're going to print it, typically 300, 600 or 1200 dpi

make sure whatever program you're printing with knows your printer resolution, otherwise a 1200 dpi image will print out HUGE!

student1616 · 12th December 2006, 05:41 PM

thanks
i really don't know abt this printing issue for 1-1,thats why i used to get huge printout.but this time i'll try to take print at the exact resolution.

justDIY · 12th December 2006, 05:51 PM

this is one I did a few weeks ago, converts the SOT23 package (up to the full 6 pins) to a 300 mil (skinny) DIP6

philba · 12th December 2006, 07:25 PM

I've always wondered about using electrolysis to etch. the problem I see with this is you need full electrical connectivity to ensure that the etching happens. Any area that will become disconnected won't completely etch. One poster on that site suggests lowering the board slowly into the bath and that could work but it seems like a lot of effort. Maybe multiple points of contact with the electrode could solve the problem. Also, some attention to layout could minimize the problems.

Still, I'll stick with AP for etching. more expensive but straight forward to use.

justDIY · 12th December 2006, 07:57 PM

yea, I'll stick with caustic chemicals too

Usually I'm patient enough to let FeCl take its dear sweet time etching the board ... since I know what comes after etching is drilling and depanelizing, and that is no fun!

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11th December 2006, 04:25 PM	(permalink)
student1616	SMD to DPI pcb conversion hello all while going through my regular feeds yesterday i found a PCB etching process (in instructables.com)for SMD components using salt water as processing solution. http://www.instructables.com/id/EKVI...566X/?ALLSTEPS the method is nice but for 6pin SMD's(like max2606) i found it hard.so is there any pre-existing pcb layouts for the SMD IC's,so that we can go with the conventional procedure of laser printing and etching. a little help will be appreciated. regards

11th December 2006, 04:53 PM	(permalink)
justDIY	using Eagle, go to file, new, board ... don't bother with a schematic. add the pad layouts for your SO package and your DIP package, and use the WIRE tool to connect them... then print, iron and etch __________________ If you don't have a planet, what good are gold bars? want to contact me directly? gmail gordonthree check out my project website: http://projects.dimension-x.net Favorite numbers: 09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

11th December 2006, 06:30 PM	(permalink)
student1616	thanks for the reply. but hhhmmmmm my drawing skills always sucks.i tried but unable to get correct layout.if some one tried this before pls share ur experience

11th December 2006, 06:36 PM	(permalink)
justDIY	you don't have to draw anything ... you're simply taking two pre-drawn layouts and connecting lines from Pin 1 to Pin 1, Pin 6 to Pin 6, etc if you had an odd package layout, someone might draw it for you, but a 6 pin (sot23-6 I assume) package is as standard as sliced bread. __________________ If you don't have a planet, what good are gold bars? want to contact me directly? gmail gordonthree check out my project website: http://projects.dimension-x.net Favorite numbers: 09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

12th December 2006, 09:02 AM	(permalink)
student1616	thanks "just diy" with ur inspiration i tried and finished with a good one(i think so) i placed sod23-6,DPI pads and connected them through wires.pls have a look at the picture. http://img81.imageshack.us/img81/5020/1zf3.png but one thing bothering me is correct resolution(while exporting as image).when i used 150 it gave me above picture but if i increased it,the image size increased with the quality of pic.so what is the correct resolution for taking printout and etching it.

12th December 2006, 01:20 PM	(permalink)
justDIY	I export mine at 1200 DPI and then instruct the printer to print at that resolution, so it comes out 1 to 1 export at whatever resolution you're going to print it, typically 300, 600 or 1200 dpi make sure whatever program you're printing with knows your printer resolution, otherwise a 1200 dpi image will print out HUGE! __________________ If you don't have a planet, what good are gold bars? want to contact me directly? gmail gordonthree check out my project website: http://projects.dimension-x.net Favorite numbers: 09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

12th December 2006, 05:41 PM	(permalink)
student1616	thanks i really don't know abt this printing issue for 1-1,thats why i used to get huge printout.but this time i'll try to take print at the exact resolution.

12th December 2006, 07:25 PM	(permalink)
philba	I've always wondered about using electrolysis to etch. the problem I see with this is you need full electrical connectivity to ensure that the etching happens. Any area that will become disconnected won't completely etch. One poster on that site suggests lowering the board slowly into the bath and that could work but it seems like a lot of effort. Maybe multiple points of contact with the electrode could solve the problem. Also, some attention to layout could minimize the problems. Still, I'll stick with AP for etching. more expensive but straight forward to use.

12th December 2006, 07:57 PM	(permalink)
justDIY	yea, I'll stick with caustic chemicals too Usually I'm patient enough to let FeCl take its dear sweet time etching the board ... since I know what comes after etching is drilling and depanelizing, and that is no fun! __________________ If you don't have a planet, what good are gold bars? want to contact me directly? gmail gordonthree check out my project website: http://projects.dimension-x.net Favorite numbers: 09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0 Last edited by justDIY; 12th December 2006 at 07:59 PM.